The Regeneration of the Lofoten Vortex through Vertical Alignment

2020 ◽  
Vol 50 (9) ◽  
pp. 2689-2711
Author(s):  
Marta Trodahl ◽  
Pål Erik Isachsen ◽  
Jonathan M. Lilly ◽  
Johan Nilsson ◽  
Nils Melsom Kristensen
Keyword(s):  
Vortex Dynamics ◽  
Potential Vorticity ◽  
Ocean Model ◽  
Vertical Alignment ◽  
Single Vortex ◽  
The Past ◽  
Vortex Merging ◽  
Regional Ocean Model ◽  
New Perspective ◽  
Anticyclonic Eddies

AbstractObservations from the past decades have promoted the idea of a long-lived anticyclonic vortex residing in the Lofoten Basin. Despite repeatedly recorded intense anticyclones, the observations cannot firmly decide whether the signature is of a single vortex or a succession of ephemeral vortices. A vortex persisting for decades requires some reinvigoration mechanism. Wintertime convection and vortex merging have been proposed candidates. We examine Lofoten Basin vortex dynamics using a high-resolution regional ocean model. The model is initialized from a coarser state with a weak eddy field. The slope current intensifies and sheds anticyclonic eddies that drift into the basin. After half a year, an anticyclone arrives at the center, providing the nucleus for a vortex that remains distinct throughout the simulation. Analyses show that this vortex is regenerated by repeated absorption and vertical stacking of lighter anticyclones. This compresses and—in concert with potential vorticity conservation—intensifies the combined vortex, which becomes more vertically stratified and also expels some fluid in the process. Wintertime convection serves mainly to vertically homogenize and densify the vortex, rather than intensifying it. Further, topographic guiding of anticyclones shed from the continental slope is vital for the existence and reinvigoration of the Lofoten vortex. These results offer a new perspective on the regeneration of oceanic anticyclones. In this scenario the Lofoten vortex is maintained through repeated merging events. Fluid remains gradually exchanged, although the vortex is identifiable as a persistent extremum in potential vorticity.

scholarly journals Current Concept of Geometrical Accuracy

2014 ◽  
Vol 22 (34) ◽  
pp. 43-49 ◽  
Author(s):  
Augustín Görög ◽  
Ingrid Görögová
Keyword(s):  
Measurement Technology ◽  
Geometric Accuracy ◽  
Geometric Tolerance ◽  
Geometrical Accuracy ◽  
The Past ◽  
3D Scanners ◽  
Basic Concepts ◽  
New Perspective ◽  
Vega 1 ◽  
Current Standards

Abstract Within the solving VEGA 1/0615/12 research project "Influence of 5-axis grinding parameters on the shank cutter´s geometric accuracy", the research team will measure and evaluate geometrical accuracy of the produced parts. They will use the contemporary measurement technology (for example the optical 3D scanners). During the past few years, significant changes have occurred in the field of geometrical accuracy. The objective of this contribution is to analyse the current standards in the field of geometric tolerance. It is necessary to bring an overview of the basic concepts and definitions in the field. It will prevent the use of outdated and invalidated terms and definitions in the field. The knowledge presented in the contribution will provide the new perspective of the measurement that will be evaluated according to the current standards.

scholarly journals Comparative analysis of the works published in periodicals and as part of the books, with major texts of A. E. Kulakovsky

Litera ◽  
2020 ◽  
pp. 47-60
Author(s):  
Aleksandr Pavlovich Nogovitsyn
Keyword(s):  
Comparative Analysis ◽  
Early Period ◽  
Special Significance ◽  
The Past ◽  
Literary Heritage ◽  
History Of ◽  
The Subject ◽  
New Perspective ◽  
Unpublished Works

This article examines the works of A. E. Kulakovsky based on theoretical positions of D. S. Likhachev and practical data from commentaries to the volume II of A. E. Kulakovsky (author P. V. Maksimov), as well as conducts comparative analysis of the early versions with major texts of A. E. Kulakovsky. The subject of this research is the comparative analysis of A. E. Kulakovsky's early publications with major texts. The goal consists in determination and description of the authorial editing and revisions, which allows substantiating their motives for, as well as tracing the evolution of author’s thought. The discrepancies between the texts of early period and major text are viewed as improvements: addition of lines, substitution of separate words, rearrangement lines and stanzas. The novelty of this study consists in substantiation of early publications of A. E. Kulakovsky and lifetime edition as the subject of textological research. From this perspective, early publications of the works of A. E. Kulakovsky's are attributed to as research materials of cross-disciplinary nature: as the testimonies of the stage of establishment of Yakut literature as a whole, and as the variants of writer's major texts that reveal the history of his works in particular. The relevance is defined by the fact that special textological studies of poet’s separate works, including profound examination of historiographical part of his literary heritage, are currently of special significance. Over the past decade, a sizeable corpus of new documents related to A. E. Kulakovsky’s biography, including the unpublished works and scientific writings, has been revealed; this gives a new perspective on the already familiar materials in the context of analysis of his evolution as a writer and the history of publication of his works in the XX century.

Rising CO2 and warming lead to declining global canopy demand for nitrogen

2021 ◽  
Author(s):  
Ning Dong ◽  
Iain Colin Prentice ◽  
Ian Wright ◽  
Xiangzhong Luo ◽  
Nick Smith
Keyword(s):  
Photosynthetic Capacity ◽  
Carbon Uptake ◽  
Global Pattern ◽  
N Limitation ◽  
The Past ◽  
Global Trend ◽  
Green Vegetation ◽  
Leaf Level ◽  
New Perspective ◽  
N Demand

<div> <p>Nitrogen (N) limitation constrains the magnitude of terrestrial carbon uptake in response to CO<sub>2 </sub>fertilization and climate change. However, the trajectory of N demand, and how it is influenced by continuing changes in CO<sub>2 </sub>and climate, is incompletely understood. We estimate recent changes in global canopy N demand based on a well-tested optimality hypothesis for the control of photosynthetic capacity (<em>V</em><sub>cmax</sub>). The predicted global pattern of optimal leaf-level <em>V</em><sub>cmax </sub>is similar to the pattern derived from remotely sensed chlorophyll retrievals. Over the period from 1982 to 2015, rising CO<sub>2­ </sub>and warming both contributed to decreasing leaf-level N demand. Widespread increases in green vegetation cover over the same period (especially in high latitudes) imply increasing total canopy N demand. The net global trend is, nonetheless, a decrease in total canopy N demand. This work provides a new perspective on the past, present and future of the global terrestrial N cycle.</p> </div>

Implementation and Validating of the Regional Ocean Model System (ROMS) for the Sunda Strait connecting the Java Sea to the Indian Ocean

2021 ◽  
Author(s):  
Subekti Mujiasih ◽  
Jean-Marie Beckers ◽  
Alexander Barth
Keyword(s):  
Time Series ◽  
Indian Ocean ◽  
Vertical Profile ◽  
Ocean Model ◽  
Model System ◽  
Satellite Sst ◽  
Regional Ocean Model System ◽  
Regional Ocean Model ◽  
The Indian Ocean ◽  
Java Sea

<p>Regional Ocean Model System (ROMS) has been simulated for the Sunda Strait, the Java Sea, and the Indian Ocean. The simulation was undertaken for thirteen months of data period (August 2013 – August 2014). However, we only used four months period for validation, namely September – December 2013. The input data involved the HYbrid Coordinate Ocean Model (HYCOM) ocean model output by considering atmospheric forcing from the European Centre for Medium-Range Weather Forecasts (ECMWF), without and with tides forcing from TPXO and rivers. The output included vertical profile temperature and salinity, sea surface temperature (SST), seas surface height (SSH), zonal (u), and meridional (v) velocity. We compared the model SST to satellite SST in time series, SSH to tides gauges data in time series, the model u and v component velocity to High Frequency (HF) radial velocity. The vertical profile temperature and salinity were compared to Argo float data and XBT. Besides, we validated the amplitude and phase of the ROMS seas surface height to amplitude and phase of the tides-gauges, including four constituents (M2, S2, K1, O1).</p>

Application of HY-2 Satellite SST Data in 4D Variational Assimilation Ocean Forecast Model

2017 ◽  
Vol 8 (2) ◽  
pp. 15-26
Author(s):  
Zhenchang Zhang ◽  
Libin Gao ◽  
Minquan Guo ◽  
Riqing Chen
Keyword(s):  
Time Window ◽  
Forecast Model ◽  
Ocean Model ◽  
Satellite Sst ◽  
Regional Ocean Model System ◽  
Model Research ◽  
Numerical Ocean Model ◽  
Regional Ocean Model ◽  
Taiwan Straits ◽  
Marine Environmental

The 4D variational (4DVAR) assimilation numerical ocean model research is proposed. This model for Taiwan Straits (TWS) is based on Regional Ocean Model System (ROMS). The background of the 4DVAR method is introduced and the development process of assimilation system is presented. In the present research, the model assimilated with Sea Surface Temperature (SST) data of HY-2 satellite (Qi, 2012; Xu, 2013) which is the first marine environmental monitoring satellite of China. In this paper, the model processes from Feb. 1 to Feb. 7, 2014 with one-day assimilation time window and root mean square error (RMSE) reduces averagely by 14.7%.

scholarly journals Research journey of respirasome

2020 ◽  
Vol 11 (5) ◽  
pp. 318-338 ◽  
Author(s):  
Meng Wu ◽  
Jinke Gu ◽  
Shuai Zong ◽  
Runyu Guo ◽  
Tianya Liu ◽  
...  
Keyword(s):  
Short Review ◽  
Research Field ◽  
Atomic Scale ◽  
Inner Mitochondrial Membrane ◽  
Macroscopic Scale ◽  
The Past ◽  
Transport Chain ◽  
High Resolution Structure ◽  
New Perspective ◽  
Resolution Structure

AbstractRespirasome, as a vital part of the oxidative phosphorylation system, undertakes the task of transferring electrons from the electron donors to oxygen and produces a proton concentration gradient across the inner mitochondrial membrane through the coupled translocation of protons. Copious research has been carried out on this lynchpin of respiration. From the discovery of individual respiratory complexes to the report of the high-resolution structure of mammalian respiratory supercomplex I1III2IV1, scientists have gradually uncovered the mysterious veil of the electron transport chain (ETC). With the discovery of the mammalian respiratory mega complex I2III2IV2, a new perspective emerges in the research field of the ETC. Behind these advances glitters the light of the revolution in both theory and technology. Here, we give a short review about how scientists ‘see’ the structure and the mechanism of respirasome from the macroscopic scale to the atomic scale during the past decades.

scholarly journals Public opinion on crime, punishment and the death penalty in Barbados

2019 ◽  
Vol 22 (3) ◽  
pp. 302-320
Author(s):  
Lynsey Black ◽  
Lizzie Seal ◽  
Florence Seemungal
Keyword(s):  
Public Opinion ◽  
Death Penalty ◽  
Social Order ◽  
Post Colonial ◽  
Crime And Punishment ◽  
Focus Group Research ◽  
The Past ◽  
Group Research ◽  
Global North ◽  
New Perspective

The bulk of extant research on public opinion on crime and punishment is focused on Global North nations. This article contributes a new perspective to the literature on punitivism by examining public opinion on crime, punishment and the death penalty in Barbados. The article presents insights from exploratory focus group research conducted in Barbados in 2017. These findings are particularly relevant as Barbadian lawmakers navigate reform of the nation’s death penalty law. While the focus groups reveal anxieties that echo those identified in other jurisdictions, related to nostalgia for the past and concern regarding social order for instance, they also demonstrate the specific relevance of time and place. Using approaches from Caribbean Criminology and drawing on post-colonial perspectives, the article examines the context of views on punishment in Barbados, including perceptions of ‘neo-colonial’ interference and concerns about what can be lost in the process of ‘progress’.

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